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Radeon Compatibility Guide - ATI/AMD Graphics Cards

Joined
May 14, 2012
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Hello everybody.

I was wondering if there is any way to get R9 390X to work with dual displays in El Capitan without using iGPU as primary?
I already use a Sapphire Radeon HD 7790 Dual-X OC working with 2 displays one connected to HDMI port and the other is connected to DVI port and everything works just fine.

I've read somewhere in this forum using DisplayPort might work but since I don't have a HDMI to display port cable or any convertors at my disposal right now I thought someone might have a solution.

Thanks guys.
 
Joined
May 14, 2012
Messages
34
Motherboard
GA-Z170X-Gaming 5
CPU
Intel 6700k
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EVGA GeForce GTX 1070 SC
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Hi Fl0r!an,

Thanks for the quick reply and your great topic.

When I boot with a single display attached everything works fine, but when I boot with second display connected both displays go dark.
When I boot with one display connected after OS is loaded then I attach the second display, both displays work fine.
I tried injecting ati=true and different farmebuffer settings it got worse.
 
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@Fl0r!an
280X Saphire under El Capitan need IGPU enable like Sierra?
It's the only way I have to get desktop after black screen.

I checked and unchecked NO inject ati and any framebuffer or ID in config.sys
 
Joined
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Anyone having color flashing issues with 10.12.4?
AMD Radeon HD6790 with modified Info.plist on AMDX3000 and AMD6000Controller, was working perfectly with 10.12.3.
@Ur-Quan said "setting RGBA8888 mode can solve this", worth a try!
 
Joined
Dec 19, 2014
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ASUS Prime Z390-A
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Anyone having color flashing issues with 10.12.4?
AMD Radeon HD6790 with modified Info.plist on AMDX3000 and AMD6000Controller, was working perfectly with 10.12.3.
my screen is flashing
ATI Radeon HD 5000 1024 MB
 
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Joined
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